use google-auth-library master branch until next release

Author: stephenplusplus

package.json

@@ -53,7 +53,7 @@
     "duplexify": "^3.2.0",
     "extend": "^2.0.0",
     "fast-crc32c": "^0.1.3",
-    "google-auth-library": "^0.9.3",
+    "google-auth-library": "google/google-auth-library-nodejs#master",
     "mime-types": "^2.0.8",
     "node-uuid": "^1.4.2",
     "once": "^1.3.1",